I think this page convolutes (at least) two tropes. "Planet name that sounds vaguely like Zrg" is a trope, sister trope to A Villain Named Zrg
. "Planet that is a descriptive noun with a generic suffix" (like tropolon or funktron or swampica) is a different trope. "Planet name that I think sounds cool" is not a trope.
To me, this appears to be about naming a Planet of Hats. If a planet's hat is cowardice, then whether it's named Bunnylar or Rabbitron should make no difference. Planet names of "descriptive name + suffix" appear all the time in parody series, such as Futurama (Wormulon, Amphibios, Igloopiter), Sin Fest (Orphantron, Furrytopia), Earthworm Jim (Insectika), or Space Quest (Pestulon).
So I suggest restricting this
trope to "planet names that sound like zrg", and YKTTW
'ing a new trope for "descriptive noun + suffix" planet names.
Special trousers. Very heroic.